Battery-powered hands-free device has loudspeaker, microphone, electronic circuit and battery associated with electronic circuit that is independent of external, central voltage source

摘要

The device has a loudspeaker (4), a microphone (9) and an electronic circuit (3) connected to a voltage supply. The mobile telephone communicates with the electronic circuit via an interface. The voltage supply is a battery (5) associated with the electronic circuit and is independent of an external, central voltage source.